Updating nationality traits during game

[Connacht]

Every faction has its own cultural/nationality traits for every familiy member.
For instance, Greek generals may be Spartans or Bosphorans, while Seleucid generals may be Persians, Armenians, Macedonians etc.

However, as in history happened, I thought that a faction may "unlock" other nationality traits after conquering and assimilating a region.
I.e. the Seleucids conquer Carthage, after 10/20 years they will be able to get Puno-Hellenic or Carthaginian husbands for their family women; or the Celtic factions may obtain Celto-Hellenic or Italo-Hellenic generals if they conquer Greece/Italy and mantain them for a number of turns (in order to simulate the progressive assimilation of the conquered people).
Obviously they won't be available until that moment, unless a player trains a client ruler.
Simply I thought that having a great empire but generals from only few regions of it, after some years, was a little unrealistic.
Otherwise factions like the Eastern Greek ones shouldn't have Egyptians, Bactrians, Indians, Sogdians, Syrians etc. in the family but only Macedonian generals.

Is possible to script something like this?